Processes for making harmful chemical substances harmless, or less harmful, by effecting a chemical change in the substances

Classification Context

Section:

HUMAN NECESSITIES

Class:

LIFE-SAVING; FIRE-FIGHTING

Subclass:

CHEMICAL MEANS FOR EXTINGUISHING FIRES; PROCESSES FOR MAKING HARMFUL CHEMICAL SUBSTANCES HARMLESS, OR LESS HARMFUL, BY EFFECTING A CHEMICAL CHANGE; COMPOSITION OF MATERIALS FOR COVERINGS OR CLOTHING FOR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; COMPOSITION OF MATERIALS FOR TRANSPARENT PARTS OF GAS-MASKS, RESPIRATORS, BREATHING BAGS OR HELMETS; COMPOSITION OF CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS

Scope Notes

Glossary: Catalyst Substance which either increases or decreases the speed of a chemical reaction, without itself undergoing a permanent chemical change. Chalcogen Also known as chalcogenides, specifically O, S, Se, Te. Harmful Directly toxic to living organisms, with the exception of toxic to plants only. Harmful chemical substances harmful chemical substance Chemical waste substances which are too hazardous or toxic to be discarded in an ordinary municipal landfill. Halogens The elements F, Cl, Br ,I , At. Physico-chemical Having at least one chemical step and one physical step. Sludge Residue (normally viscous) from an industrial, residential, or agricultural process. | Limiting references: Detoxification of foods or foodstuffs Apparatus for chemical, physical or physico-chemical processes in general Treatment of gases, e.g. chemical or biological purification of smoke or fumes, e.g. flue gas Purification or modifying the chemical compositions of combustible gases containing carbon monoxide Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust Consuming noxious gases by combustion Chemical processes resulting in the production of a useful product, e.g. using untreated contaminated fly ash as raw material in the manufacture of cement Metals obtained from residues or scrap Treatment of radioactively-contaminated waste | Application references: Treatment of waste water, sewage or sludge Making explosives harmless by detonation

Related Keywords

Child Classifications

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• A62D 3/02 by biological methods, i.e. processes using enzymes or microorganisms
• A62D 3/1 by subjecting to electric or wave energy or particle or ionizing radiation
• A62D 3/2 by hydropyrolysis or destructive steam gasification, e.g. using water and heat to effect chemical change
• A62D 3/3 by reacting with chemical agents
• A62D 3/4 by heating to effect chemical change, e.g. by pyrolysis